Klyde O'Scope
Chameleon Enthusiast
Having built one (and spending far too much on it ) I can attest to two things.I’m torn between getting the Zen for Spike or just making my own.
1. Building one won't save you any money.
2. However, you'll get exactly what you want, and more bang for your buck. (Better quality).
I've mentioned it before, but there are some kits for around the same price that I think are at least worth a look-see:
Talking Serpents
For DIY plans, I think what you want are crossfire enclosure plans; that's what I based mine on (with substantial modifications ).
If I can help, you know where to find me.